The second way is to apply for a French invention patent through the European Patent Office: this way is low-cost, simple and fast, but it cannot cover 44 European countries, because the European Patent Office currently has only 38 member countries. The European Patent Office is one of the best, strongest and most modern patent offices in the world, so the quality of invention patents recognized by the European Patent Office is relatively high.
The last way is to apply for registration of a French invention patent separately: if you register a French invention patent separately, you need to submit the application documents to the French Intellectual Property Office, and the official language is French, so you need to translate the application documents into French, which will generate additional translation costs.